Yeah, the PCP airguns are why all of my comments were specifically referenced to "conventional" airguns. There are manual pumps available to charge the PCP airguns. They require a lot of determination and perseverance from what I understand and they're not particularly cheap.
The PCP airguns are roughly equivalent to blackpowder rifles in terms of performance. There's a practical limit on velocity so you have to make up for it with large projectiles if you want more power. That means pronounced trajectories. When you start getting into this power range and using more bullet-like projectiles, you lose all of the benefits of airguns. A high-powered PCP is loud like a firearm and has a much longer dangerous range than a conventional airgun.